Number of one-element transitions among partitions of the integer n for unlabeled parts.

Terms

a(0) =0a(1) =0a(2) =2a(3) =4a(4) =10a(5) =18a(6) =34a(7) =56a(8) =94a(9) =146a(10) =228a(11) =340a(12) =506a(13) =730a(14) =1050a(15) =1476a(16) =2066a(17) =2844a(18) =3896a(19) =5268a(20) =7090a(21) =9442a(22) =12518a(23) =16454a(24) =21534a(25) =27980a(26) =36210a(27) =46572a(28) =59674a(29) =76056